Node.js Application Deployment Issue

I tried deploying my node.js app with netlify-cli. The deployment was successful. But the site returns “Not found”.
Here is the link:

GitHub repository with my application:

branch for deploy: attempt4

This is a very simple node.js application.
I am doing this for the first time.
If someone could tell me what my mistake is I would really appreciate it.

Please refer to:

Express on Netlify | Netlify Docs